Pierakstīties
Mathematics for IGCSE & O level - Sequences (Section 1 - No. 46)
For the sequence 2, 6, 12, 20, 30, find the formula for the nth term.
n^2+1
n(n+1)
n^2 - 1
n(n+2)
Paskaidrojums
The differences between the terms increase by 2. The formula is n(n+1).
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